Late-Time Magnetogenesis Driven by Axionlike Particle Dark Matter and a Dark Photon.

08:00 EDT 20th July 2018 | BioPortfolio

Summary of "Late-Time Magnetogenesis Driven by Axionlike Particle Dark Matter and a Dark Photon."

We propose a mechanism generating primordial magnetic fields after the e^{+}e^{-} annihilations. Our mechanism involves an ultralight axionlike particle (ALP) which constitutes the dark matter and a dark U(1)_{X} gauge boson introduced to bypass the obstacle placed by the conductivity of cosmic plasma. In our scheme, a coherently oscillating ALP amplifies the dark photon field, and part of the amplified dark photon field is concurrently converted to the ordinary magnetic field through the ALP-induced magnetic mixing. For the relevant ALP mass range 10^{-21}  eV≲m_{ϕ}≲10^{-17}  eV, our mechanism can generate B∼10^{-24}  G(m_{ϕ}/10^{-17}  eV)^{5/4} with a coherent length λ∼(m_{ϕ}/10^{-17}  eV)^{-1/2} kpc, which is large enough to provide a seed of the galactic magnetic fields. The mechanism also predicts a dark U(1)_{X} electromagnetic field E_{X}∼B_{X}∼80  nG(m_{ϕ}/10^{-17}  eV)^{-1/4}, which can result in interesting astrophysical or cosmological phenomena by inducing the mixings between the ALP, ordinary photon, and dark photon states.


Journal Details

This article was published in the following journal.

Name: Physical review letters
ISSN: 1079-7114
Pages: 031102


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